GB2478337A - Polypropylene blend with nanoparticulate fillers - Google Patents
Polypropylene blend with nanoparticulate fillers Download PDFInfo
- Publication number
- GB2478337A GB2478337A GB1003596A GB201003596A GB2478337A GB 2478337 A GB2478337 A GB 2478337A GB 1003596 A GB1003596 A GB 1003596A GB 201003596 A GB201003596 A GB 201003596A GB 2478337 A GB2478337 A GB 2478337A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polymer
- polypropyleneic
- filler
- blend
- polymer blend
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000945 filler Substances 0.000 title claims abstract description 59
- 239000000203 mixture Substances 0.000 title claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 title abstract description 18
- -1 Polypropylene Polymers 0.000 title abstract description 16
- 229920001155 polypropylene Polymers 0.000 title abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 73
- 229920002959 polymer blend Polymers 0.000 claims abstract description 34
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- 239000012764 mineral filler Substances 0.000 claims description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000002902 bimodal effect Effects 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 235000013305 food Nutrition 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920005604 random copolymer Polymers 0.000 description 2
- 235000020989 red meat Nutrition 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 101000785596 Homo sapiens Zinc finger protein 875 Proteins 0.000 description 1
- 102100026512 Zinc finger protein 875 Human genes 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910001748 carbonate mineral Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical compound [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 description 1
- 229910000271 hectorite Inorganic materials 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to a polymer blend comprising one or more polypropyleneic polymers and a nanoparticulate filler, to a process for preparing the polymer blend and to an article composed of the polymer blend. Preferably the filler is calcium carbonate (CaCO3) and is present in the range of 1-4 wt%. The polypropylene is also preferably a bimodal distribution of a high molecular weight PP and a low molecular weight PP. The resultant composition can be formed into a film with improved gas barrier properties.
Description
POLYMER
The present invention relates to a polymer blend comprising one or more polypropyleneic polymers and a nanoparticulate filler, to a process for preparing the polymer blend and to an article composed of the polymer blend.
Polymer-based consumer packaging is widely used in a number of industries. For example, polypropylene is used in food packaging but its inadequate gas barrier properties often contribute to food with a poor shelf-life. Whilst gas-flushing of the polymer can serve to increase the shelf-life of food, it is a time-consuming and expensive procedure.
The present invention is based on the recognition that nanoparticulates are able to occupy voids between polymer chains in a polypropyleneic polymer to create a tortuous gas path. More particularly, the present invention seeks to improve the gas barrier properties of polypropyleneic articles (eg packaging) by incorporating a nanoparticulate filler.
Thus viewed from a first aspect the present invention provides a polymer blend comprising: one or more polypropyleneic polymers; and a nanoparticulate filler.
The polymer blend may be usefully extruded into a polypropyleneic article with improved strength at lower guages and excellent gas barrier properties.
The or each polypropyleneic polymer may be independently selected from the group consisting of a homopolymer and a copolymer (eg a random copolymer or block copolymer). Preferably the or each polypropyleneic polymer is a polypropylene homopolymer.
In a preferred embodiment, the one or more polypropyleneic polymers are a first polypropyleneic polymer and a second polypropyleneic polymer, wherein the melt flow index of the first polypropyleneic polymer is greater than the melt flow index of the second polypropyleneic polymer. Typically the melt flow index of the first polypropyleneic polymer is 15 or more, preferably 20 or more, particularly preferably or more. Typically the melt flow index of the second polypropyleneic polymer is or less, preferably 10 or less, particularly preferably 3 or less.
The first polypropyleneic polymer may be a low molecular weight polypropyleneic polymer. The second polypropyleneic polymer may be a high molecular weight polypropyleneic polymer.
The mean particle diameter of the particles of the nanoparticulate filler may be in the range 2 to óOOnm, preferably 10 to 3 OOnm, more preferably 70 to 13 Onm.
Typically the particle size distribution is such that a majority (eg 90% or more) of the particles of the nanoparticulate filler have a diameter of 200nm or less, preferably a diameter in the range 10 to 1 9Onm, more preferably a diameter in the range 70 to l3Onm.
Preferably the nanoparticulate filler is dispersive in the one or more polypropyleneic polymers. Preferably the nanoparticulate filler is substantially non-agglomerative in the one or more polypropyleneic polymers.
In a preferred embodiment, the nanoparticulate filler forms platelets in the one or more polypropyleneic polymers. Preferably the platelets are delaminable. Preferably the platelets are exfoliable. The mean thickness of the platelets may be mm or more.
The mean lateral dimensions of the platelets may be in the range 75 to 1 5Onm.
The nanoparticulate filler may be a mineral filler (eg a natural unmodified filler), a synthetic filler (eg a synthetic layered filler), an organomodified filler (eg a mineral filler or synthetic filler as hereinbefore defined modified by an organic material) or a mixture thereof.
The nanoparticulate filler may be a clay such as an organoclay (eg a clay mineral which is physically or chemically modified by an organomodifier).
The nanoparticulate filler may be an inorganic (eg polar inorganic) filler. The inorganic filler may be a silicate (eg an alumnosilicate, hydrous magnesium silicate or calcium silicate), phosphate, sulphate or carbonate.
The nanoparticulate filler may be selected from the group consisting of bentonite, hectorite, montmorillonite, hydrotalcite, fluormica, dolomite, baryte (eg barium sulfate), Talc, Wollastonite, kaolin, smectite, silica, calcite, mica, feldspar, titania and carbon black.
Preferred fillers are carbonate mineral fillers (eg calcite).
A preferred nanoparticulate filler is montmorillonite.
A preferred nanoparticulate filler is calcium carbonate. Calcium carbonate improves thermal conductivity of the polypropyleneic polymer and therefore processing speeds.
An increase in flexural modulus and dimensional stability offers down gauging possibilities. The polymer blend of this embodiment has higher heat distortion temperature, improved gas barrier properties and is straightforward to process (eg extrude and thermoform).
Typically the amount of nanoparticulate filler in the polymer blend is in the range 4.Owt% or less, preferably 2.Owt% or less.
Preferably the amount of nanoparticulate filler in the polymer blend is in the range l.Owt% to 4.Owt%.
Preferably the amount of nanoparticulate filler in the polymer blend is in the range 1.Owt% to 2.Owt%.
The polymer blend may further comprise a lubricant. The lubricant may be selected from the group consisting of a long chain saturated or unsaturated carboxylic acid (eg fatty acid) or salt thereof (eg zinc stearate) or amide thereof (eg Erucamide) and wax (eg polyethylene wax). The lubricants may be present in an amount in the range 0.2 to O.4wt%.
Preferably the polymer blend is obtained or obtainable by blending a blend of a first polypropyleneic polymer and a nanoparticulate filler with a second polypropyleneic polymer.
Viewed from a further aspect the present invention provides a process for preparing a polymer blend as hereinbefore defined comprising: (A) blending a blend of a first polypropyleneic polymer and a nanoparticulate filler with a second polypropyleneic polymer.
The first polypropyleneic polymer and second polypropyleneic polymer may be independently selected from the group consisting of a homopolymer and a copolymer (eg a random copolymer or block copolymer).
Preferably the first polypropyleneic polymer is a polypropylene homopolymer.
Preferably the second polypropyleneic polymer is a polypropylene homopolymer.
Particularly preferably each of the first polypropyleneic polymer and second polypropyleneic polymer is a polypropylene homopolymer.
In a preferred embodiment, the melt flow index of the first polypropyleneic polymer is greater than the melt flow index of the second polypropyleneic polymer. Typically the melt flow index of the first polypropyleneic polymer is 15 or more, preferably 20 or more, particularly preferably 25 or more. Typically the melt flow index of the second polypropyleneic polymer is 15 or less, preferably 10 or less, particularly preferably 3 or less.
The first polypropyleneic polymer may be a low molecular weight polypropyleneic polymer. The second polypropyleneic polymer may be a high molecular weight polypropyleneic polymer.
Preferably in step (A) the weight ratio of the second polypropyleneic polymer to the blend of the first polypropyleneic polymer and nanoparticulate filler is in the range 4 to 99, particularly preferably 9 to 19.
Preferably the process further comprises: (B) extruding the polymer blend into an article.
Step (B) may be carried out in an extruder such as a single screw extruder.
In a preferred embodiment, step (A) is preceded by (AO) preparing the blend of a first polypropyleneic polymer and a nanoparticulate filler by mixing homogeneously the first polypropyleneic polymer and the nanoparticulate filler.
Preferably step (AO) is carried out by mixing homogeneously the first polypropyleneic polymer and the nanoparticulate filler in the presence of one or more lubricants.
Preferably in step (AO) the weight ratio of first polypropyleneic polymer to nanoparticulate filler is in the range 1.5 to 6, particularly preferably 2 to 4.
Step (AO) may be carried out by extrusion (eg in a twin screw extruder).
In a preferred embodiment, step (AO) is preceded by (AOO) mixing homogeneously the first polypropyleneic polymer and the one or more lubricants.
Preferably in step (AOO) the weight ratio of first polypropyleneic polymer to lubricant is 15 or more.
Step (AOO) may be carried out in a blender (eg a ribbon blender).
Viewed from a yet further aspect the present invention provides an article composed of a polymer blend as hereinbefore defined.
Preferably the article is an extruded article.
The article may be packaging, Preferably the article is food packaging.
The present invention will now be described in a non-limitative sense with reference
to Examples.
EXAMPLE 1
Preparation of Polypropylene Nanocarbonate Filler Nanoparticulate calcium carbonate (nanocarbonate) in white powder form was pre-blended with process lubricants zinc stearate, polyethylene wax and Erucamide in a ribbon blender to ensure a homogeneous mix. The compositional characteristics of the nanocarbonate were: Coating content 24-36 g/kg Loss on drying* < 6 g/kg Mean particle diameter (dp) 0.07-0.13 im Residue on sieve (45 tim) < 250 ppm Yield value 90 -250 Pa Crystal structure Calcite Rhombohedral Crystal shape Cubic Appearance White powder Refractive index 1.658 Density 2.71 g/cm Free flowing density* 350 gft Specific surface area* 16 m/g MOHS hardness 3 CAS Number 47 1-34-1 EINECS Number 207-439-9 Powdered polypropylene homopolymer (Cannel T89) was added to the mix to produce a batch for blending into a polypropylene nanocarbonate filler. The proportions of each material in the batch were: zinc stearate 2wt% polyethlene wax lwt% Erucamide lwt% nanocarbonate (white powder form) 2Owt% polypropylene powder (Carmel T89) 76wt%.
Polypropylene nanocarbonate filler was prepared from the batch using a co-rotating twin screw extruder with the following parameters: LD ratio of the screw 35:1 Barrel temperature profile 180 °C all zones Screw speed 500 rpm Line pressure 50 bar +.
Preparation of Polypropylene/Polypropylene Nano carbonate Filler Blends In order to prepare polypropylene/polypropylene nanocarbonate filler blends, virgin polypropylene homopolymer (Sasol HKR1O2) was blended with two different loading levels of polypropylene nano carbonate filler by single screw sheet extrusion. At a first loading level of Swt% polypropylene nanocarbonate filler prepared as described above (and 95wt% Sasol HKR1O2), it was possible to achieve a distribution of lwt% nanocarbonate throughout the extruded sheet. At a second loading level of 1 Owt% (and 9Owt% Sasol HKR1 02), it was possible to achieve a distribution of 2wt% nanocarbonate throughout the extruded sheet. The materials were pre-blended in a G2 Gravimetric Maguire Blender and then fed to the main feed throat of a Diamat single screw extruder with the following dimensions:
Description Value Unit
Screw diameter 125 mm Screw length 3.125 m Internal barrel diameter 125 mm External barrel diameter 170 mm Screw pitch 125 mm Screw feed depth 19 mm Screw metering depth 6.5 mm [Flight Helix angle 17.65 Diamat 1 Screw Compression ratio 3:1 Diamat 1 L/D ratio 25:1 Line pressure 50 bar before gear pump Line pressure 125 bar after gear pump Gear Pump speed 50 rpm.
The extruder die head dimensions and parameters were:
Description Value Unit
Die width 1250 mm Die zone 1 temperature 230 °C Die zone 2 temperature 225 °C Die zone 3 temperature 225 °C Die zone 4 temperature 225 °C Die zone 5 temperature 230 The main line barrel extruder temperatures were:
Description Value Unit
Zone 1 180 °C Zone2 185 °C Zone 3 190 °C Zone4 195 °C Zone 5 200 °C Zone 6 205 °C Zone7 210 °C Zone 8 215 °C Zone 9 220 °C The three roll vertical cooling and polishing stack had the following characteristics: Roller Value Unit Top roller 40 °C Middle roller 35 °C Bottom roller 30 Shelf-Life Test A tray prepared from polypropylene/polypropylene nanocarbonate filler blend containing 2wt% nanocarbonate was tested for shelf life of red meat under the following conditions: Test temperature 5°C 29-31% CO2 59-71% Nitrogen 2% residual 02.
It was 16 days before the condition of the red meat was unacceptable. The target number of days is typically more than 21. This is substantially better than a tray produced from 100% polypropylene which survives for about 6 days.
Claims (17)
- CLAIMS1. A polymer blend comprising: one or more polypropyleneic polymers; and a nanoparticulate filler.
- 2. A polymer blend as claimed in claim 1 wherein the or each polypropyleneic polymer is a polypropylene homopolymer.
- 3. A polymer blend as claimed in claim 1 or 2 wherein the one or more polypropyleneic polymers are a first polypropyleneic polymer and a second polypropyleneic polymer, wherein the melt flow index of the first polypropyleneic polymer is less than the melt flow index of the second polypropyleneic polymer.
- 4. A polymer blend as claimed in any preceding claim wherein the mean particle diameter of the particles of the nanoparticulate filler is in the range 70 to 13 Onm.
- 5. A polymer blend as claimed in any preceding claim wherein the nanoparticulate filler is substantially non-agglomerative in the one or more polypropyleneic polymers.
- 6. A polymer blend as claimed in any preceding claim wherein the nanoparticulate filler forms platelets in the one or more polypropyleneic polymers.
- 7. A polymer blend as claimed in any preceding claim wherein the nanoparticulate filler is a mineral filler, a synthetic filler, an organomodified filler or a mixture thereof.
- 8 A polymer blend as claimed in any preceding claim wherein the nanoparticulate filler is a silicate, phosphate, sulphate or carbonate.
- 9. A polymer blend as claimed in any preceding claim wherein the nanoparticulate filler is calcium carbonate.
- 10. A polymer blend as claimed in any preceding claim wherein the amount of nanoparticulate filler in the polymer blend is in the range 1.Owt% to 4.Owt%.
- 11. A polymer blend as claimed in any preceding claim wherein the amount of nanoparticulate filler in the polymer blend is in the range 1.Owt% to 2.Owt%.
- 12. A polymer blend as claimed in any preceding claim wherein the polymer blend is obtained or obtainable by blending a blend of a first polypropyleneic polymer and a nanoparticulate filler with a second polypropyleneic polymer.
- 13. A process for preparing a polymer blend as defined in any preceding claim comprising: (A) blending a blend of a first polypropyleneic polymer and a nanoparticulate filler with a second polypropyleneic polymer.
- 14. A process as claimed in claim 13 wherein the first polypropyleneic polymer is a low molecular weight polypropyleneic polymer and the second polypropyleneic polymer is a high molecular weight polypropyleneic polymer.
- 15. A process as claimed in claim 13 or 14 wherein in step (A) the weight ratio of the second polypropyleneic polymer to the blend of the first polypropyleneic polymer and nanoparticulate filler is in the range 9 to 19.
- 16. A process as claimed in any of claims 13 to 15 wherein step (A) is preceded by (A0) preparing the blend of a first polypropyleneic polymer and a nanoparticulate filler by mixing homogeneously the first polypropyleneic polymer and the nanoparticulate filler, wherein the weight ratio of first polypropyleneic polymer to nanoparticulate filler is in the range 1.5 to 6.
- 17. An article composed of a polymer blend as defined in any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003596A GB2478337A (en) | 2010-03-04 | 2010-03-04 | Polypropylene blend with nanoparticulate fillers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003596A GB2478337A (en) | 2010-03-04 | 2010-03-04 | Polypropylene blend with nanoparticulate fillers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201003596D0 GB201003596D0 (en) | 2010-04-21 |
| GB2478337A true GB2478337A (en) | 2011-09-07 |
Family
ID=42136460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1003596A Withdrawn GB2478337A (en) | 2010-03-04 | 2010-03-04 | Polypropylene blend with nanoparticulate fillers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2478337A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108822411A (en) * | 2018-06-01 | 2018-11-16 | 合肥语林装饰工程有限公司 | A kind of drainage pipeline high strength composite and preparation method thereof |
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| US20050203235A1 (en) * | 2004-03-15 | 2005-09-15 | Caiguo Gong | Nanocomposite comprising stabilization functionalized thermoplastic polyolefins |
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| US20070106005A1 (en) * | 2005-11-10 | 2007-05-10 | Graham Packaging Pet Technologies Inc. | Methods for intercalating, exfoliating and/or dispersing clay particles, and articles incorporating such clay particles |
| US20070243350A1 (en) * | 2004-07-19 | 2007-10-18 | Forsberg Gunnar S | Packages |
| US20080249231A1 (en) * | 2007-04-09 | 2008-10-09 | Sudhin Datta | Soft homogeneous isotactic polypropylene compositions |
| US20090105374A1 (en) * | 2007-09-28 | 2009-04-23 | Dow Global Technologies Inc. | Thermoplastic olefin composition with improved heat distortion temperature |
| CN101628645A (en) * | 2009-07-30 | 2010-01-20 | 浙江大东南包装股份有限公司 | Antibacterial BOPP/PP food composite package film and preparation method |
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| US20060100376A1 (en) * | 2002-04-26 | 2006-05-11 | Marc Dupire | Processing of bimodal polymers |
| US20050203235A1 (en) * | 2004-03-15 | 2005-09-15 | Caiguo Gong | Nanocomposite comprising stabilization functionalized thermoplastic polyolefins |
| US20070243350A1 (en) * | 2004-07-19 | 2007-10-18 | Forsberg Gunnar S | Packages |
| US20070106005A1 (en) * | 2005-11-10 | 2007-05-10 | Graham Packaging Pet Technologies Inc. | Methods for intercalating, exfoliating and/or dispersing clay particles, and articles incorporating such clay particles |
| US20080249231A1 (en) * | 2007-04-09 | 2008-10-09 | Sudhin Datta | Soft homogeneous isotactic polypropylene compositions |
| US20090105374A1 (en) * | 2007-09-28 | 2009-04-23 | Dow Global Technologies Inc. | Thermoplastic olefin composition with improved heat distortion temperature |
| CN101628645A (en) * | 2009-07-30 | 2010-01-20 | 浙江大东南包装股份有限公司 | Antibacterial BOPP/PP food composite package film and preparation method |
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| CN108822411A (en) * | 2018-06-01 | 2018-11-16 | 合肥语林装饰工程有限公司 | A kind of drainage pipeline high strength composite and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201003596D0 (en) | 2010-04-21 |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |